stein



C. STEIN.

' Dec. 20,- 1927.

nucurznurvs mamn:

original r-ned April so. 1919 3 SHEETS-SHE" Dec. 20,1927. Re, 16,826

RECUPBRATIVE FURNACE y 3 SHEETS-SHEET 2. Original Filed April 30,' l919 c. STEIN.

Der; 20,1921.

' RBCUPBMTIVE FURNAC! origina; finaux-11 so. 191s Inventor.

Reissued Dec. 2o, 1921'.l

UNITED STATES CHARLES OF PARIS, FRANCE, ASSIGNOR TO SOCETE CH. M. STEIN & CIE., 02|?` 126.416,826 PATENT OFFICE.

PARIS, FRANCE, AUCORPOBATION F FRANCE. i

RECUPERATIVE FURNACE.

Original No.1,350,624, dated August 24, 1920, Seri'al No. 293,820, led April 30,. 1919. Application for reissue led October 5, 1927. Serial No. 224,247.

The resent invention has for its object a vert-ica continuously recuperative furnace intended more particularly for the reheating of ingots to the temperature necessary for forging or rolling.

The invention is described hereinafter in detail with reference to the accompanying drawings which represent, by way of example and diagrammatically, a constructional form of the furnace. Figure 1 represents the furnace in vertical section on the line C, D, E, F of Fig. 2.

Fig. 2 represents the furnace in plan on the section A, B of Fig. 1.

Fig. 3 represents a vertical section of Fig. 2 on the line G, I-I, I, J.

Fig. 4 shows an upper or plan View in detail illustrating the construction of the re'- cuperator.

In the drawing, 1 is algallery by which -the gases of combustion arrivey and which may be common to a series of furnaces of the same type,.2 is a damper for regulatlng the flow of the gases by t e passages 3 and 4 into the working chamber or hearth 5, 6 is a. flue by which the air to support combustion arrives which passes through the passage 7, the recuperator 8, and the passages 9, l() and 11 to be mixed in 4 with the gases and cause the combustion thereof. The products of this combustion are evacuated through the lues 12 through the recuperator' 8 and the lues 13, 14 and 15 and pass into the smoke collector 17. The recuperator is a `hollow tile like construction, arranged in spaced vertical tiers, allowing for the transverse assage of the' products of combustion and yreason of the hollow formation of the units ,comprising the tiers, vertical-openings are 'provided'for the passage of air, as clearly shown in Fig. 4. The regulation of the draft is produced by a damper located at 16. The hearth communicates by the passage 18 with the cleaning it 19. P The action of the furnace is as follows:

The gas arrives by the galleryl, passes through and 3 up to the entrance to the hearth at 4, and at the same time, the air to support combustion enters by the passages 6 and 7, passes through the recuperutor S where it is heated,then passes through the passages 9, 10 and 11 to arrive at 4 where it meets the gas and mixes with this and air and also the exit of the Smoke can' be regulated by means of speciaLdampers.

In View of the' construction of the furnace as illustrated by the drawings, it will A 4 be apparent that the mixtures of air and combustible gases issuing from the ports 3. and 4 will enter the hearth 5 at its ends and pass along the top sides thereof towards the outer end gradually bending downward and passing along the bottoms and the side walls back to the exit conduits 12. Owing to the fact that the hearth is in the form of a horse shoe, the burning gases will pass along the sides thereof and curve along the ends without directly impinging on the infgots, but rather surrounding them on all sides with the flame. The natural downward motion of thecooled gases is facilitated and augmented by the arrangement ofthe openings to the conduits 4 and 12,450 that the incoming gases enter at a point higher than the outgoingfgases. The latter pass downwardly through the recuperator while the air coming in through the port 6 passes upwardly .through the recuperator into the passage 10 and thence to the passages 4. Furthermore, by reason of the arrangement of the lues 3 and 4 and the deflecting walls leading from the iues 3 downwardly into the flues 4, the gases will be mixed and combustion there fore started before they emerge from the lues 4 into the hearth chamber 5, `this action. being lof advantage in heating the `ingots on all sides vof the heart-h equally.

This continuous recuperative furnace possesses' over the inversion type of furnace f the cleaning pit is .Y

.regulated or extinguished i individually.

I claim: 1. A -vertical furnace of the class de-l scribed, comprising ak hearth, means for admitting and burning therein a combustible mixture of air and gas, means for exhausting the 'products of combustion. therefrom, a recuperator through which, the incommg air.v asses and through which the outgoing vpro ucts of combustion pass for heating said air, and a smoke collector for the finalv exhausting of the products of combustion provided with means for regulating said 4 exhaust.

2. A 'vertical furnace of the class described, consistin of av number of complete, separate and in ependent units having in common, a cleaning pit, a gas supply gallery and smoke collector, each of said units comprising a hearth, means for admittin therein a` combustible mixture of gas an heated air, mea-ns for exhausting theproducts of combustion therefrom, a recuperator through which the -incoming air passes and through which the outgoing products of combustion pass for heating saidair, and means for cutting out one or more of the separate units without interfering with. the continuous operation of the remalning units and the furnace as a whole.

3. A. vertical furnace vof the class described, cons'istin of a number of complete,

separate and in ependent units having 1n f common a gassupply and smoke collector, eacliof said units being provided with a- V hearth, passage-ways connecting said gas supplg' heart 'an air passa e-way communicating with said mixing c amber, a recuperator' through which the air passes before entering said air passage-way, another passage-way leading from the hearth to the recu rator for conducting the products ofcom ustion therethrough, said recuperator so constructed `andposltioned that the air will pass upwardly and the productsr of combustion so' admissionof the gas to the mixing chamber downwardly, and regulating means for the and also for the admission` of the air to the recuperator and the exhausting scribed,v comprisin of the products of` combustion from sai recuperator, thewhole forming a furnace of continuous operation.

4. A vertical furnace of the class dea hearth, means for -ad mlttlng and burnlng therein a combustible mixture iof air and gas, means for-exhaust ing the products of combustion therefrom,

" 'said admitting means andiexhausting means bein both located in the same sidewall of the rnace, a 'recuperator through which with a .mixing chamber adjacent the i' mixture of air and gas, means f or exhaust i in the products of combustion therefrom, said admitting means and exhausting means bein the urnace and said admitting means being locatedabove the exhausting means, a recuperator through which the incoming air passes' and through which the outgoing hausting of the products of combustion provided. with means for regulating said exhaust.

6. A furnace as set forth in claim 2 wherein means is provided inconnection with each unit for regulating the rate at which the products of combustion are exhausted there- 7. A furnace as set forth in claim2, wherein said admitting and exhausting means are both located in one sidewall of thevfurnace, and said cleaning pit is located beyond the opposite sidewall, together with passa ef ways adapted to afford communication etween said cleaning pit and the respective hearths. f

8. A vertical furnace for the purpose described comprising a hearth, means for admitting and burning near the top of the hearth a combustible mixture of air and gas, means vfor exhausting the products of combustion therefrom substantially directly below the place of admission of the said combustible mixture, a recuperator through vwhich the incoming'air passes and through which the outgoing roducts of combustion ass for heating'sai air, a smoke collector both located inthe same sidewall of Y Vvproducts of combustion pass for heating said air, and a smoke collector'for the nal eir-Y said exhaust.

9. A vertical furnace for the purpose described comprising ahearth, means for ady mitting near the top ofthe-hearth and burning therein a combustible mixture of air and gas, means for exhausting the products of combustion therefrom near the bottom of the hearth, a recuperator throughwhich the incoming air passes and through which the outgoing products of combustion pass for heatingsaidair, a smoke collector for'the final exhausting of the products of combustion, and means forV regulating said exhaust.

Executed this' 21st day of September,

" CHARLES STEIN. 

